American National Election Studies (ANES 1948-2012)

Who identifies as Democrat vs. Republican? 

How has this changed over time for various demographic groups? Visual below shows trends in political identification in American society over the past 60 years. 

Who identifies as Liberal vs. Conservative?

Same analysis as above but with Ideological identification. Note that American National Election Studies (ANES) did not ask question on ideological identification prior to 1972. Graphs below show trends from 1972–2012.